r/elasticache_cluster: add SetTagsDiff function to CustomizeDiff sequence

[anGie44]

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Closes #19614

Output from acceptance testing (Commercial):

--- SKIP: TestAccAWSElasticacheCluster_SecurityGroup_Ec2Classic (2.08s)
--- PASS: TestAccAWSElasticacheCluster_NumCacheNodes_Redis (13.19s)
--- PASS: TestAccAWSElasticacheCluster_Port_Redis_Default (498.22s)
--- PASS: TestAccAWSElasticacheCluster_Memcached_FinalSnapshot (2.71s)
--- PASS: TestAccAWSElasticacheCluster_AZMode_Redis (624.22s)
--- PASS: TestAccAWSElasticacheCluster_AZMode_Memcached (632.30s)
--- PASS: TestAccAWSElasticacheCluster_Engine_Redis (652.45s)
--- PASS: TestAccAWSElasticacheCluster_Port (652.73s)
--- PASS: TestAccAWSElasticacheCluster_Engine_Memcached (654.06s)
--- PASS: TestAccAWSElasticacheCluster_multiAZInVpc (654.42s)
--- PASS: TestAccAWSElasticacheCluster_vpc (655.63s)
--- PASS: TestAccAWSElasticacheCluster_ParameterGroupName_Default (673.70s)
--- PASS: TestAccAWSElasticacheCluster_snapshotsWithUpdates (689.04s)
--- PASS: TestAccAWSElasticacheCluster_NumCacheNodes_Decrease (865.83s)
--- PASS: TestAccAWSElasticacheCluster_NumCacheNodes_IncreaseWithPreferredAvailabilityZones (1095.04s)
--- PASS: TestAccAWSElasticacheCluster_NumCacheNodes_Increase (1132.08s)
--- PASS: TestAccAWSElasticacheCluster_Redis_FinalSnapshot (778.00s)
--- PASS: TestAccAWSElasticacheCluster_NodeTypeResize_Memcached (1283.16s)
--- PASS: TestAccAWSElasticacheCluster_ReplicationGroupID_AvailabilityZone (1384.90s)
--- PASS: TestAccAWSElasticacheCluster_ReplicationGroupID_SingleReplica (1403.37s)
--- PASS: TestAccAWSElasticacheCluster_EngineVersion_Memcached (1406.74s)
--- PASS: TestAccAWSElasticacheCluster_ReplicationGroupID_MultipleReplica (1405.37s)
--- PASS: TestAccAWSElasticacheCluster_NodeTypeResize_Redis (1423.06s)
--- PASS: TestAccAWSElasticacheCluster_EngineVersion_Redis (2106.66s)

[ewbankkit]

LGTM 🚀.

[ghost]

This has been released in version 3.44.0 of the Terraform AWS provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template for triage. Thanks!

[github-actions]

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